class Settings():
    """ A class to store all settings for Alien Invasion"""
    
    def __init__(
            self,screen_width=1200, screen_height=600,
            bg_color=(230,230,230)
            ):
        
        """ Initialize the game's settings"""
        self.screen_width = screen_width
        self.screen_height = screen_height
        self.bg_color = bg_color
        
        # Ship settings
        self.ship_limit = 3
        
        # Set the attribute of bullets.
        self.bullet_width = 3
        self.bullet_height = 15
        self.bullet_color = (60, 60, 60)
        self.bullets_allowed = 3
        
        # Set the attribute of aliens. 
        self.fleet_drop_speed = 30
        # fleet_direction of 1 represents right; -1 represents left.
        self.fleet_direction = 1
        
        # To speedup whole game so as to increase game's challenge
        self.speedup_scale = 1.1
        self.score_scale = 1.5
        self.initialize_dynamic_settings()
    
    def initialize_dynamic_settings(self):
        """ Initialize settings that change throughout the game. """
        self.ship_speed_factor = 1.5
        self.bullet_speed_factor = 3
        self.alien_speed_factor = 1
        self.fleet_direction = 1
        self.alien_scores = 50
    
    def increase_speed(self):
        """ Increase speed settings. """
        self.ship_speed_factor *= self.speedup_scale
        self.bullet_speed_factor *= self.speedup_scale
        self.bullet_speed_factor *= self.speedup_scale
        
        self.alien_scores = int(self.alien_scores*self.score_scale)

        
